Jump to content

Recommended Posts

Advertisement (gone after registration)

I recently picked up an MP in perfect working order, except for the fact that it meters about 2-3 stops under exposed as compared to other meters and my test roll results. The battery is correct and the iso circuitry works properly according to a test I ran with DAG over the phone.

 

The only two things which seem to make sense is that somehow it is out of calibration, which is not common apparently. Or, the white metering dot which is dark/dirty is causing the shift. when I place a fine white cloth over the shutter curtain. The meter appears to be accurate. Could this be the cause of the inaccurate reading? I’ve attached a picture of the dot.

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

Link to post
Share on other sites

x

Compared to the white spot on my recently CLA'ed (by Leica) M6 (which, as part of the work, had the shutter curtains replaced).  Your spot seems to have lost a fair amount of the white paint.  The spot on my M6 is fully white all over, no black fabric pattern showing.  As the metering in these cameras is done by reflecting light from the spot to a sensor under the upper part of the lens mount, it makes sense a change in the reflectivity of the spot would alter the meter reading.  I may be missing something in exactly how the sensor works, but if your less than fully white spot has any effect on the metering, I would think that it should reflect less light to the sensor making the camera "think" the scene is darker than it really is which should result in a reading that would give an overexposure.

Link to post
Share on other sites

6 minutes ago, Robert Ardinger said:

Compared to the white spot on my recently CLA'ed (by Leica) M6 (which, as part of the work, had the shutter curtains replaced).  Your spot seems to have lost a fair amount of the white paint.  The spot on my M6 is fully white all over, no black fabric pattern showing.  As the metering in these cameras is done by reflecting light from the spot to a sensor under the upper part of the lens mount, it makes sense a change in the reflectivity of the spot would alter the meter reading.  I may be missing something in exactly how the sensor works, but if your less than fully white spot has any effect on the metering, I would think that it should reflect less light to the sensor making the camera "think" the scene is darker than it really is which should result in a reading that would give an overexposure.

I think I agree with you and my test agreed too. I’m just perplexed how it got so dark, and wish I had an explanation, of how it became far out of so out of calibration, if the dot is not the culprit.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...